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ISP Disconnects Customers with Open WiFi

"Not all ISPs are happy with customers who have open WiFi,
however, and some even threaten to disconnect those who do. In the
September 2008 terms and conditions of UK ISP Karoo, we read
(pdf):

""We shall be entitled to terminate the Service immediately if
We discover that you have permitted (whether knowingly or not) a
third party (or third parties) to access the Service using a
wireless connection over Your Communications Line.""